strategies → avx2 Relation

File in src/strategies	Includes file in src/strategies/avx2
strategies-dct.c	dct-avx2.h
strategies-encode.c	encode_coding_tree-avx2.h
strategies-intra.c	intra-avx2.h
strategies-ipol.c	ipol-avx2.h
strategies-picture.c	picture-avx2.h
strategies-quant.c	quant-avx2.h
strategies-sao.c	sao-avx2.h